EP2348257B1 - Appareil de cuisson a microondes - Google Patents

Appareil de cuisson a microondes Download PDF

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Publication number
EP2348257B1
EP2348257B1 EP09834343.7A EP09834343A EP2348257B1 EP 2348257 B1 EP2348257 B1 EP 2348257B1 EP 09834343 A EP09834343 A EP 09834343A EP 2348257 B1 EP2348257 B1 EP 2348257B1
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EP
European Patent Office
Prior art keywords
section
microwaves
heating
tray
heated
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Application number
EP09834343.7A
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German (de)
English (en)
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EP2348257A1 (fr
EP2348257A4 (fr
Inventor
Koji Yoshino
Hiroshi Kawai
Kazumi Iwasaki
Ichiro Hori
Yuji Hayakawa
Takahiko Yamasaki
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Panasonic Corp
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Panasonic Corp
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Publication of EP2348257A4 publication Critical patent/EP2348257A4/fr
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Publication of EP2348257B1 publication Critical patent/EP2348257B1/fr
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    • H—ELECTRICITY
    • H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
    • H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
    • H05B6/00—Heating by electric, magnetic or electromagnetic fields
    • H05B6/64—Heating using microwaves
    • H05B6/72—Radiators or antennas
    • H05B6/725—Rotatable antennas
    • H—ELECTRICITY
    • H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
    • H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
    • H05B6/00—Heating by electric, magnetic or electromagnetic fields
    • H05B6/64—Heating using microwaves
    • H05B6/6408—Supports or covers specially adapted for use in microwave heating apparatus
    • H—ELECTRICITY
    • H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
    • H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
    • H05B6/00—Heating by electric, magnetic or electromagnetic fields
    • H05B6/64—Heating using microwaves
    • H05B6/6414—Aspects relating to the door of the microwave heating apparatus
    • H—ELECTRICITY
    • H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
    • H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
    • H05B6/00—Heating by electric, magnetic or electromagnetic fields
    • H05B6/64—Heating using microwaves
    • H05B6/6447—Method of operation or details of the microwave heating apparatus related to the use of detectors or sensors
    • H05B6/645—Method of operation or details of the microwave heating apparatus related to the use of detectors or sensors using temperature sensors
    • H—ELECTRICITY
    • H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
    • H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
    • H05B6/00—Heating by electric, magnetic or electromagnetic fields
    • H05B6/64—Heating using microwaves
    • H05B6/6447—Method of operation or details of the microwave heating apparatus related to the use of detectors or sensors
    • H05B6/6464—Method of operation or details of the microwave heating apparatus related to the use of detectors or sensors using weight sensors
    • H—ELECTRICITY
    • H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
    • H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
    • H05B6/00—Heating by electric, magnetic or electromagnetic fields
    • H05B6/64—Heating using microwaves
    • H05B6/647—Aspects related to microwave heating combined with other heating techniques
    • H05B6/6482—Aspects related to microwave heating combined with other heating techniques combined with radiant heating, e.g. infrared heating
    • H—ELECTRICITY
    • H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
    • H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
    • H05B6/00—Heating by electric, magnetic or electromagnetic fields
    • H05B6/64—Heating using microwaves
    • H05B6/647—Aspects related to microwave heating combined with other heating techniques
    • H05B6/6491—Aspects related to microwave heating combined with other heating techniques combined with the use of susceptors
    • H05B6/6494—Aspects related to microwave heating combined with other heating techniques combined with the use of susceptors for cooking
    • H—ELECTRICITY
    • H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
    • H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
    • H05B6/00—Heating by electric, magnetic or electromagnetic fields
    • H05B6/64—Heating using microwaves
    • H05B6/66—Circuits
    • H05B6/68—Circuits for monitoring or control
    • H05B6/688—Circuits for monitoring or control for thawing
    • H—ELECTRICITY
    • H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
    • H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
    • H05B6/00—Heating by electric, magnetic or electromagnetic fields
    • H05B6/64—Heating using microwaves
    • H05B6/76—Prevention of microwave leakage, e.g. door sealings
    • H05B6/766—Microwave radiation screens for windows

Definitions

  • the present invention relates to a microwave cooking device that dielectrically heats an object to be heated.
  • An microwave oven that represents a microwave cooking device has come to be a cooking tool essential in daily life owing to its simplicity of being able to directly heat food as an object to be heated and not requiring preparation for a pot or a pan.
  • a product has been put into practical use which has a heating chamber for housing food in a shape with a large width and enhanced convenience, formed by flattening a bottom surface of a space inside the heating chamber and further making a width to be not smaller than 400 mm that is relatively larger than a depth, so that a plurality of dishes can be arrayed and heated.
  • the "grilling function” is a function where a so-called heating plate is used which is provided on its under face with a microwave absorber, such as ferrite, that absorbs microwaves to generate heat, and a temperature of the heating plate is raised with microwaves to cook food placed thereon.
  • the "defrosting function” is a function where frozen food is heated with microwaves, steam or a combination of these, to defrost the food.
  • Microwave cooking device 300 includes magnetron 302, waveguide 303, heating chamber 301, placing table 306, feeding section (antenna space 310), rotary antenna 305, motor 304, heating plate 308, plate holding section 307, and heating device 309.
  • Magnetron 302 represents a microwave generating device.
  • Waveguide 303 transmits microwaves radiated from magnetron 302 to heating chamber 301.
  • Heating chamber 301 is placed on its inside with an object to be heated (not shown) such as food, and then used in a heating operation with microwaves.
  • Placing table 306 is made up of a low-loss dielectric material, such as ceramic or glass, predisposed to facilitate microwaves to transmit therethrough, and fixed to the inside of heating chamber 301 and placed with the object to be heated.
  • Feeding section 310 is an antenna space formed below placing table 306 inside heating chamber 301.
  • Rotary antenna 305 is fitted to the vicinity of the center of heating chamber 301, extending from waveguide 303 to feeding section 310, to radiate microwaves inside waveguide 303 into heating chamber 301.
  • Motor 304 rotationally drives rotary antenna 305.
  • Heating plate 308 is mounted inside heating chamber 301 in accordance with an application, and plate holding section 307 supports heating plate 308.
  • Heating device 309 performs electrothermal heating.
  • a microwave heating treatment is started in a state where food or the like is placed on placing table 306.
  • Microwaves radiated from magnetron 302 pass through waveguide 303 and rotary antenna 305, and are radiated from the upper surface of a radiation section of rotary antenna 305 toward heating chamber 301.
  • rotary antenna 305 normally radiates the microwaves while rotating at a constant rate in order to uniformly stir the microwaves inside heating chamber 301 (e.g. refer to Patent Document 1).
  • the frozen food is first placed on a heat-resistant tray or flat plate, and the tray or the flat plate in that state is placed on placing table 306.
  • the defrosting function is then selected, to start an operation of the microwave cooking device.
  • the defrosting operation is completed (e.g. refer to Patent Document 2).
  • microwave cooking devices 300 different from the one configured as described above, which has a plurality of substantially rectangular slit holes as openings provided around the heating plate body, and in which a slit hole closing material formed of rubber chiefly composed of ferrite is detachably provided with respect to the slit holes (e.g. refer to Patent Document 3).
  • frozen food is placed on a heat-resistant tray or flat plate, and the tray or the flat plate in that state is placed on placing table 306. Further, the slit hole closing material is detached to open up the slit holes, and a menu is selected, to start an operation of the microwave cooking device. When the object to be heated reaches a predetermined temperature or the operation is performed for a set period of time, the defrosting operation is completed.
  • Patent Document 1 Unexamined Japanese Patent Publication No. 2004-071216
  • Patent Document 2 Unexamined Japanese Patent Publication No. H09-229372
  • Patent Document 3 Unexamined Japanese Patent Publication No. 2007-225186 .
  • Patent Document JP 2006 196336 A is disclosing a microwave cooking device according to the preamble of claim 1
  • the present invention is to provide a microwave cooking device according to claim 1, which is capable of performing a defrosting function and a grilling function in an automatic and continuous manner without a user's operation even in the case of setting a heating plate with an object to be heated placed thereon inside a heating chamber.
  • the present invention has a configuration including: a heating chamber provided with a glass-fitted door at a front opening, for housing an object to be heated; a microwave-transparent placing table constituting a bottom surface inside the heating chamber; a metal heating plate, on an under face of which a microwave absorber is provided, which is detachably mounted in the heating chamber, and on which the object to be heated is placed; a microwave generating section; a waveguide for transmitting microwaves from the microwave generating section to the heating chamber; a directional feeding section having directivity, for supplying the microwaves from the waveguide to the heating chamber; a driving section for rotationally driving the directional feeding section; a control section for controlling the driving section to turn the directional feeding section to a direction of the door and supply the microwaves into a space above the heating plate, using the inside of the glass as a principal transmission channel; and a feeding section formed below the placing table, and housing the directional feeding section.
  • the inside of the door as a transmission channel for microwaves without using an additional material and requiring processing on an existing material. That is, it is possible to effectively utilize a dead space without making the configuration complicated, so as to increase an amount of diffraction of microwaves to the upper side of the heating plate. It is thereby possible to obtain desired finishing of cooking suitable for the kind of the object to be heated, such as the object to be heated having been made to directly absorb microwaves and defrost, and also to improve heating efficiency. Accordingly, it is possible to perform the defrosting function and the grilling function in an automatic and continuous manner without a user's operation in a state where the heating plate with the object to be heated placed thereon is mounted inside the heating chamber.
  • door 31b is fitted to body 31a in microwave oven 31.
  • heating chamber 34 that houses an object to be heated such as food, magnetron 32 that generates microwaves for cooking the object to be heated, and waveguide 33 connected to magnetron 32 for guiding the microwaves into heating chamber 34.
  • Front-face opening 38 is formed on the front face of heating chamber 34.
  • Door 31b is fitted to body 31a, and configured so as to openably/closably cover front-face opening 38 formed in heating chamber 34.
  • Door 31b may be fitted to body 31a via a hinge or as a sliding type such as a sliding door.
  • a sliding type such as a sliding door.
  • microwave oven 31 is of a built-in type
  • door 31b may be fitted to body 31a in such a form as to be drawn out.
  • the door When fitted via the hinge, the door may be fitted to any one of the left side, the right side, and the lower side of front-face opening 38.
  • Door 31b includes metal plate 60, inner glass 61 and outer glass 62 that sandwich metal plate 60 in a front-back direction, and a choke cover (not shown) that covers an outer periphery of metal plate 60.
  • a choke cover (not shown) that covers an outer periphery of metal plate 60.
  • metal plate 60 of a position opposed to front-face opening 38 a plurality of through holes are formed so as to make the inside of heating chamber 34 visible.
  • Choke structure 63 is formed on the outer periphery of metal plate 60.
  • FIG. 2 illustrates the case of bending metal plate 60 a plurality of times to form choke structure 63.
  • choke structure 63 is preferably formed at the end of metal plate 60 by bending the end section formed in comb shape a plurality of times with a plurality of slits provided at predetermined intervals.
  • the number of slits are not particularly limited.
  • Inner glass 61 functions to constitute one face of heating chamber 34 with door 31b in a closed state. Inner glass 61 makes the inside of heating chamber 34 visible with door 31b in the closed state. Outer glass 62 functions to constitute the outside surface of door 31b. As does inner glass 61, outer glass 62 also makes the inside of heating chamber 34 visible with door 31b in the closed state.
  • Microwave oven 31 includes placing table 35, feeding section (antenna space) 37, rotary waveguide 39, motor 41, control section 411, and photo interrupter 36. It should be noted that heating chamber 34 is connected to the top of waveguide 33, and forms a space with a size in a width direction (about 400 mm) being larger than a size in the depth direction (about 310 mm).
  • Placing table 35 is made of a low-loss dielectric material, such as ceramic or glass, predisposed to facilitate microwaves to transmit therethrough, and is fixed to the inside of heating chamber 34 for placement of food (not shown) that represents the object to be heated.
  • Feeding section 37 is formed below placing table 35 inside heating chamber 34.
  • Rotary waveguide 39 is fitted to the inside of feeding section 37 to radiate microwaves inside waveguide 33 into heating chamber 34.
  • Motor 41 is a driving section that rotationally drives rotary waveguide 39.
  • Control section 411 is a control section that controls motor 41 to control rotation and an orientation of rotary waveguide 39.
  • Photo interrupter 36 constitutes an origin detection mechanism that detects an origin of each rotation of rotary waveguide 39.
  • rotary waveguide 39 is a directional feeding section having open section 58 shown in FIGS. 3A to 3C and being capable of radiating microwaves with concentration on a direction that open section 58 faces.
  • heating device 401 capable of performing electrothermal heating is mounted on the upper surface of heating chamber 34.
  • heating chamber 34 has three stages of plate holding sections that support heating plate 402. Specifically, heating chamber 34 has upper-stage plate holding section 403, middle-stage plate holding section 404, and lower-stage plate holding section 405. It is to be noted that upper-stage plate holding section 403, middle-stage plate holding section 404 and lower-stage plate holding section 405 are generically referred to as plate holding section 400.
  • Heating plate 402 is described with reference to FIGS. 9A to 9C.
  • FIG. 9A shows a plan view of heating plate 402 seen from above.
  • Fig. 9B shows a side view of heating plate 402 seen from side.
  • FIG. 9C shows a view of a cross section 9C-9C in FIG. 9A .
  • Heating plate 402 is made up of frame-shaped periphery 402a, and plate 402c which is formed inside periphery 402a and in which a plurality of grooves 402b (not shown in FIG. 9C ) with a predetermined depth are formed in parallel.
  • the object to be heated is placed on this plate 402c, which is placed inside heating chamber 34.
  • Microwave absorber 406 e.g. ferrite
  • operation section 31c is disposed in a front-face lower portion of door 31b.
  • Operation section 31c is a device with which a variety of cooking menus are selectable by the user in accordance with food and cooking contents. For example, with operation section 31c, it is possible to set heating time, and select a previously set automatic cooking menu, such as a "warming function", a "defrosting function”, a “defrosting/grilling function” or a "grilling function”.
  • the "warming function” refers to a cooking method of radiating microwaves toward food so as to heat the food.
  • the “defrosting function” refers to a frozen-food defrosting method performed by a method of continuously or intermittently radiating microwaves to frozen food to heat the food, a method of heating and defrosting frozen food with steam, or a method of defrosting food by combination of these.
  • the "defrosting/grilling function” refers to cooking such that open section 58 of rotary waveguide 39 is turned to either a direction of front-face opening 38 of heating chamber 34, being a direction in which microwaves are apt to diffract to the upper surface of the heating plate, or a direction of a gap between an outer edge of heating plate 402 and an inner wall of heating chamber 34, to allow frozen food placed on heating plate 402 to absorb microwaves and defrost, and subsequently, the defrosted food is cooked by the later-mentioned "grilling function".
  • open section 58 of rotary waveguide 39 is turned to front-face opening 38 of heating chamber 34, a heating-plate upper surface heating mode, with which a supply of microwaves to the upper surface of heating plate 402 is large, is executed to allow frozen food placed on heating plate 402 to absorb microwaves and defrost, and subsequently, the defrosted food is cooked by the later-mentioned "grilling function".
  • the "grilling function” refers to concentration of microwaves on microwave absorber 406 on the back face side of heating plate 402 with food placed thereon, to generate heat at a high temperature.
  • the function refers to a cooking method of heating food via heating plate 402, and a cooking method of heating food by combination of the above heated-up heating plate 402 and a heating device.
  • control section 411 controls magnetron 32 and motor 41, to execute these menus.
  • Microwave oven 31 controls open section 58, as a site with strong radiation directivity, of rotary waveguide 39 to a predetermined orientation, and especially in the "defrosting/grilling function", in the first half, an amount of diffraction of microwaves to the upper surface of heating plate 402 is increased, to efficiently perform defrosting. In the last half, the microwaves are concentrated on microwave absorber 406 on the back face side of the plate of heating plate 402, to efficiently generate heat. A specific control is described later.
  • coupling section 46 is formed of a substantially cylindrical conductive material passing through a substantially circular coupling hole (not shown) provided on an interface face between waveguide 33 and heating-chamber bottom surface 42.
  • Radiation section 48 is formed of a conductive material generally having a wider area in a horizontal direction than in a vertical direction, and electrically connected by crimping, welding, or the like, to the top end of coupling section 46 so as to be integrated.
  • Rotary waveguide 39 includes coupling section 46 and radiation section 48.
  • rotary waveguide 39 is fitted to shaft 50 of motor 41 such that the center of coupling section 46 matches the center of the rotational drive.
  • Radiation section 48 is configured to have radiation directivity since having a non-uniform shape with respect to a rotating direction.
  • the center of rotation of rotary waveguide 39 is arranged at the center of the inside of heating chamber 34.
  • radiation section 48 is formed such that radiation-section upper surface 52 is formed in trapezoidal shape with open section 58 side taken as a base, as seen from above.
  • Three sides out of the four sides of the trapezoidal shape except for the base have radiation-section bent sections 54, having been bent to heating-chamber bottom surface 42 ( FIG. 1 ) side, and are configured so as to limit radiation of microwaves to the outside of those three sides.
  • rotary waveguide 39 may be constantly rotated as has conventionally been done. Further, in the case of being able to realize more uniform heating by stopping of rotary waveguide 39 at a certain angle in the middle of rotation, stopping may be mixed with the rotation. In the present embodiment, the rotation is constantly performed.
  • rotary waveguide 39 may be rotated and stopped at predetermined time intervals, and in the case of being able to realize more uniform heating by constant rotation, the rotation is constantly performed. In the present embodiment, the rotation is constantly performed.
  • heating plate 402 with the frozen food placed thereon is set on predetermined plate holding section 400, such as upper-stage plate holding section 403.
  • Open section 58 of rotary waveguide 39 is turned to front-face opening 38 of heating chamber 34, microwaves reach the upper side of heating plate 402 via inner glass 61 of door 31b, to defrost the frozen food placed on heating plate 402, and subsequently after the defrosting, the food is cooked by means of the grilling function.
  • rotary waveguide 39 In the case of heating food placed on heating plate 402 by means of the "grilling function", the operation of rotary waveguide 39 may be stopped or rotary waveguide 39 may be constantly rotated in a state where open section 58 of rotary waveguide 39 faces a predetermined position (e.g. different direction from that of front-face opening 38).
  • control section 411 stores angle information (stopping position) of rotary waveguide 39, taking as a reference an origin detected by an origin detection mechanism having photo interrupter 36. As shown in FIG. 3A , the stopping position is taken as 180 degrees in a state where open section 58 of rotary waveguide 39 faces door 31b, and is taken as an origin position (0 degrees) in a state where open section 58 faces backward.
  • microwaves are radiated with concentration on inner glass 61 of door 31b.
  • the radiated microwaves then pass through a gap between heating plate 402 and inner glass 61, the inside of inner glass 61, a gap space between the inner glass and metal plate 60, to diffract to the upper side of heating plate 402.
  • inner glass 61 is a dielectric, and a wavelength of the microwaves that travel through the dielectric is reduced to a value multiplied by a reciprocal of a square root of a dielectric constant of the dielectric.
  • the glass corresponds to existence of a space gap about twice to three times as large as a thickness of the glass. This allows many of the microwaves radiated to inner glass 61 side to diffract to the upper side of heating plate 402 through use of the this wide gap.
  • a suitable orientation of rotary waveguide 39 for the "grilling function" is not sweepingly decided, the orientation is at least different from the state where the rotary waveguide 39 faces the direction of door 31b. It is therefore considered that the suitable orientation is previously obtained by experiment, and then stored into control section 411.
  • microwave oven 31 controls the orientation of rotary waveguide 39 in accordance with the position of heating plate 402.
  • a method of using a stepping motor as motor 41 there is considered a method of using a stepping motor as motor 41, a method of detecting a reference position to control conducting time even when a constantly rotated motor is used, or some other method.
  • the origin detection mechanism is described with reference to FIG. 4 .
  • the origin detection mechanism is provided in shaft 50 of the stepping motor used as motor 41.
  • the origin detection mechanism is made up of disc 36a with shaft 50 taken as a central shaft and photo interrupter 36.
  • Disc 36a is provided with a rectangular slit 36b.
  • Disc 36a is fitted to shaft 50 of motor 41 that rotates rotary waveguide 39, and rotates so as to block an optical path of photo interrupter 36 including a light-emitting device and a light-receiving device.
  • Control section 411 includes antenna controlling section 412 and storing section 413.
  • Antenna controlling section 412 controls an operation of motor 41, to control an operation of rotary waveguide 39.
  • Storing section 413 stores positional information (angle information) of rotary waveguide 39.
  • Antenna controlling section 412 references to necessary information from storing section 413 in accordance with a command signal from operation section 31c, and controls motor 41, to control the operation of rotary waveguide 39.
  • Storing section 413 stores positional information of rotary waveguide 39 which is suitable for defrosting and positional information of rotary waveguide 39 which is suitable for heating of heating plate 402 with respect to each of the positions (upper stage, middle stage, lower stage) where heating plate 402 is placed inside heating chamber 34.
  • positional information 414 180 degrees clockwise from the origin
  • positional information 415 130 degrees clockwise from the origin
  • positional information 416 230 degrees clockwise from the origin
  • microwave oven 31 is powered on, to come into a standby state in step S102.
  • step S102 the state is a menu selection accepting state made by the user using operation section 31c.
  • operation section 31c outputs to control section 411 menu signal Sm in accordance with menu selection made by the user.
  • the user selects the "warming function", the "defrosting/grilling function”, the "grilling function”, or some other menu in accordance with contents of an object to be heated (kind of food) which is wished to be heated.
  • the menu includes the position (upper stage, middle stage or lower stage) where heating plate 402 is placed.
  • operation section 31c When it is determined that the "warming function" has been selected, operation section 31c outputs to antenna controlling section 412 menu signal SmA representing the "warming function”. The control then goes to next step S103.
  • step S103 antenna controlling section 412 responses to menu signal SmA, and rotates motor 41 at a constant rate so as to rotate rotary waveguide 39 at a constant rate.
  • the control then goes to next step S104.
  • step S104 control section 411 makes magnetron 32 operated so as to start a heating treatment. The control then goes to next step S105.
  • step S105 a timer starts counting time. After the lapse of a first predetermined period P1 has been confirmed, the control goes to next step S106.
  • step S106 operations of magnetron 32 and the like are stopped, to complete the heating treatment by means of the "warming function".
  • step S102 when the "defrosting/grilling function" is selected, operation section 31c outputs to antenna controlling section 412 menu signal SmB representing that the "defrosting/grilling function" has been selected. The control then goes to next step S107.
  • step S107 based upon menu signal SmB, antenna controlling section 412 determines whether or not the position where heating plate 402 is placed is the upper stage. It should be noted that with the "defrosting/grilling function", the kind such as meat, fish or pizza is selectable. The control then goes to next step S108.
  • step S108 based upon the positional information determined in step S107, antenna controlling section 412 controls the operation of motor 41 with reference to the corresponding positional information from storing section 413. Specifically, based upon the positional information in menu signal Sm determined in step S107, antenna controlling section 412 references to positional information 416 in storing section 413. Thereby, antenna controlling section 412 controls the operation of motor 41 such that rotary waveguide 39 rotates to a direction in which microwaves are apt to diffract to the upper surface of heating plate 402, for example to the direction of front-face opening 38 (180 degrees) and is then stopped. The control then goes to next step S109.
  • step S109 in the state where rotary waveguide 39 is stopped in the predetermined position controlled in step S108, control section 411 makes magnetron 32 operated, to start a heating treatment. The control then goes to next step S110.
  • step S110 after the lapse of predetermined stopping time, rotary waveguide 39 is again rotated to make one turn, and stopped again at 180 degrees for predetermined time. In this manner, the rotation and stopping at 180 degrees are repeated. The control then goes to next step S111.
  • step S111 the timer starts counting time. After the lapse of a second predetermined period P2 has been confirmed, the control goes to next step S112. During this time, the state of microwaves being apt to diffract to the upper side of the heating plate is kept, thereby enabling efficient defrosting of the food.
  • step S112 it is determined whether or not defrosting has been completed. When defrosting has not been completed (No in S112), defrosting is continued, and it is determined in step S112 whether or not defrosting has been completed. This is repeated until completion of defrosting.
  • the control goes to next step S113 for shifting to the "grilling function", with completion of defrosting. Thereafter, the control should shift to the "grilling function" for grilling food, in which the food may be grilled in a similar manner to the case of the "grilling function" being selected in foregoing step S102 (namely, the case of grilling originally non-frozen food).
  • step S102 when the "grilling function" is selected, operation section 31c outputs to antenna controlling section 412 menu signal SmC representing that the "grilling function" has been selected.
  • menu signal Sm representing that the "grilling function” has been selected.
  • step S113 based upon menu signal SmC, antenna controlling section 412 determines whether the position where heating plate 402 is placed is the upper stage, the middle stage or the lower stage.
  • the kind of an object to be grill-cooked such as fish, chicken thigh, roast beef, roast chicken, pizza or paella is selectable.
  • the position of the placing plate being the upper stage, the middle state or the lower stage corresponding to each kind of objects to be grill-cooked is stored, and the position of the placing plate is determined by selection of the kind of the object to be grill-cooked by means of the "grilling function".
  • the present invention is not limited thereto, and for example, a detector may be provided in each of plate holding sections 403 to 405, and the plate position may be determined by means of a signal from this detector. The control then goes to next step S114.
  • step S114 based upon menu signal SmC, antenna controlling section 412 references corresponding positional information from storing section 413, to control the operation of motor 41. For example, when the grilling function on the upper stage is selected by operation section 31c, antenna controlling section 412 references to upper-stage positional information 415, and controls the operation of motor 41 such that rotary waveguide 39 rotates to a position at 130 degrees clockwise from the origin, and is stopped at that position. The control then goes to next step S115.
  • step S115 while making rotary waveguide 39 remain stopped, control section 411 makes magnetron 32 operated to start a heating treatment. The control then goes to next step S116.
  • step S116 after the lapse of predetermined stopping time for rotary waveguide 39, rotary waveguide 39 is again rotated to make one turn, and stopped again at 130 degrees for predetermined time. In this manner, the rotation and stopping at 130 degrees are repeated. The control then goes to step S117.
  • step S117 the timer starts counting time, and after the lapse of a third predetermined period P3 has been confirmed, the control goes to next step S118. During this time, the state of microwaves being apt to concentrate on the ferrite provided on the back face of the heating plate is kept, thereby raising a temperature of the heating plate to enable efficient grilling of the under face of food.
  • step S118 magnetron 32 is stopped, and in next step S119, heating device 401 is driven.
  • step S120 the timer starts counting time, and after the lapse of a fourth predetermined period P4 has been confirmed, the control goes to next step S106. During this time, heating device 401 enables efficient grilling of the upper surface of food.
  • step S106 after stopping of operations of rotary waveguide 39, heating device 401, magnetron 32 and the like, the heating treatment by means of the "grilling function" is completed.
  • microwave oven 31 has plate holding sections 403 to 405 being three stages (upper stage, middle stage, lower stage) in heating chamber 34, and it is thereby possible to select a cooking menu in accordance with the position of the plate holding section, so as to cook a variety of food by means of the "grilling function".
  • the ferrite as microwave absorber 406, stuck on the under face of heating plate 402 absorb microwaves to generate heat, it becomes possible to grill the under face of an object to be cooked.
  • heating the upper surface of the object to be cooked with heating device 401 disposed on the upper surface of heating chamber 34 it becomes possible to perform upper surface cooking.
  • the stopping position of rotary waveguide 39 of the microwave cooking device is controlled by the position of the plate holding section.
  • the temporary stopping position of rotary waveguide 39 varies since a distribution of microwaves changes depending upon the position where heating plate 402 is placed, but the stopping position is previously obtained by an experiment as described above and stored into storing section 413. Adding the origin detection mechanism to motor 41 can lead to accurately control of the stopping position of rotary waveguide 39, thereby to realize heating with maximal efficiencies on the respective positions of the plate holding sections 403 to 405. In the "grilling function" as thus described, fewer microwaves propagate through a space above heating plate 402 (space where food is placed), thereby allowing prevention of moisture inside the food from excessively evaporating.
  • antenna controlling section 412 of control section 411 may reciprocate rotary waveguide 39 by the order of a predetermined angle (e.g. ⁇ 5 degrees) with a target angle (stopping position) taken as a center. This can lead to not a little unification of the distribution without affecting the heating efficiency of the heating plate.
  • a predetermined angle e.g. ⁇ 5 degrees
  • target angle stopping position
  • this reciprocating operation may be performed from the start of the heating
  • the configuration may be formed such that the operation is started after the lapse of predetermined time (e.g. after 30 seconds to 1 minute) from the start of the heating.
  • control section 411 is configured to have: a stopping upper limit time storing section that previously stores upper limit time for allowing stopping of rotary waveguide 39; a stopping time counting section that counts the time during stopping of rotary waveguide; and a reciprocation angle storing section that stores an angle by which rotary waveguide 39 is reciprocated.
  • the configuration may be formed so as to rotate rotary waveguide 39 only by a predetermined angle (e.g. 5 degrees) after the lapse of predetermined time (e.g. after 30 seconds to 1 minute) from the start of the heating in execution of the grilling function.
  • a predetermined angle e.g. 5 degrees
  • predetermined time e.g. after 30 seconds to 1 minute
  • the configuration may be formed to control a rotational rate of rotary waveguide 39.
  • the configuration may be formed, for example such that rotary waveguide 39 is rotated slowly in the vicinity of a predetermined position, and rotated at a constant rate in the other positions, thereby to concentrate microwaves on heating plate 402. Also in this case, at which rate in the vicinity of which position rotary waveguide is controlled so as to allow concentration of microwaves on the heating plate is previously obtained by experiment.
  • control section 411 stores a predetermined stopping position (angle) as an origin when rotary waveguide 39 is located in the predetermined stopping position (angle). Then, control section 411, for example, executes an origin detecting mode for confirming the origin of rotary waveguide 39, along with the "warming function” and the "grilling function", before or after execution of the heating treatment.
  • control section 411 performs control of stopping the operation of the magnetron during driving of rotary waveguide 39 on the origin detecting mode.
  • control section 411 performs the operation on the origin detecting mode after completion of the heating treatment, and stands by with the origin in a detected state by at the time of non-heating. This can prevent generation of standby time for detecting the origin before the start of the heating treatment.
  • FIG. 7 shows an example of temperature detectors for detecting a temperature distribution.
  • Temperature detector 10 includes infrared detecting elements 13, case 18, and stepping motor 11. Infrared detecting elements 13 are arrayed in a row on substrate 19, and case 18 houses the whole of substrate 19, and stepping motor 11 moves case 18 in a direction vertically intersecting with a direction in which infrared detecting elements 13 are arrayed.
  • the top of substrate 19 is provided with metal can 15 in which infrared detecting elements 13 are sealed, and electronic circuit 20 that processes operations of infrared detecting elements 13.
  • Can 15 is provided with lens 14 through which infrared rays pass.
  • Case 18 is provided with infrared passage hole 16 that allows passage of infrared rays and hole 17 that allows passage of a lead from electronic circuit 20.
  • the rotational operation of stepping motor 11 allows movement of case 18 in the direction vertical to the direction in which infrared detecting elements 13 are arrayed in a row.
  • the reciprocal rotational operation of stepping motor 11 of the temperature detector allows detection of a temperature distribution of almost all areas inside heating chamber 34.
  • the number of rotary waveguides 39 is not limited thereto, and may be two or more.
  • the configuration may be formed to have two rotary waveguides 90, 91 in a width direction of heating chamber 34.
  • the respective opening sections 92, 93 of rotary waveguides 90, 91 are disposed as facing the vicinity of the center inside heating chamber 34. Also in this case, how two rotary waveguides 90, 91 are positionally related to each other when microwaves are apt to diffract to the upper side of heating plate 402 or when microwaves are concentrated on heating plate 402 may be previously obtained by experiment.
  • Forming a plurality of rotary waveguides 39 increases the number of combinations of the stopping positions of rotary waveguides 90, 91 (e.g. one rotary waveguide 90 being at an original position while the other rotary waveguide 91 being at 90 degrees counterclockwise from the origin, etc.), to increase a variable width of the control of microwaves.
  • This further allows, with efficiency, diffraction of microwaves to the upper side of heating plate 402 and concentration of microwaves on heating plate 402. It is therefore possible to improve heating efficiency of defrosting and heating efficiency of grilling in the "defrosting/grilling function". Meanwhile, it becomes possible to heat with concentration on a right half or left half area, or an upper half or lower half area, of heating plate 402, expanding a range of variations of cooking procedures.
  • feeding section 37 may be provided above heating chamber 34, and microwaves are radiated from above heating chamber 34, so as to be made to diffract to the lower face of heating plate 402.
  • FIG. 10A shows a state where heating plate 402 ( FIG. 9 ) set on plate holding section 400 of heating chamber 34 is seen from above.
  • FIG. 10B shows a state where food placed on heating plate 402 being heated with microwaves is seen from a direction of inner glass 61 of door 31b.
  • rotary waveguide 39 is oriented in a lateral direction of microwave oven 31, namely a direction parallel to door 31b.
  • microwaves MW radiated from magnetron 32 are radiated to the right and left inner walls of heating chamber 34 in a roughly vertical direction and to door 31b and back wall projecting section 420 (circulating fan unit storing section) in a roughly parallel direction, via open section 58 of rotary waveguide 39. Therefore, most of the microwaves radiated inside heating chamber 34 are reflected on the right and left side walls of heating chamber 34, plate holding section 400 and the like, and most of them are ultimately absorbed into microwave absorber 406. Those are then converted into heat by microwave absorber 406 to directly heat food F from the lower side.
  • microwaves radiated from open section 58 of rotary waveguide 39 travels over heating plate 402 via the gap between heating plate 402 and door 31b and the gap between heating plate 402 and the side wall on back wall projecting section 420 side, to reach the upper side of heating chamber 34.
  • These microwaves are reflected on the inner wall of heating chamber 34, to be used for heating the object to be heated (food) placed on upper-stage plate holding section 403. That is, a space between heating plate 402 and the inner wall of heating chamber 34, generated due to door 31b and back wall projecting section 420 is utilized as a principal transmission channel to supply microwaves to the upper surface of heating plate 402.
  • microwave absorber 406 Although there are some microwaves that are reflected on the right or left side wall of heating chamber 34, plate holding section 400, and placing table 35, to be absorbed into microwave absorber 406, an amount thereof is far small as compared with the case of open section 58 being oriented in the direction parallel to door 31b. As described above, since door 31b is fitted with inner glass 61 that functions as the transmission channel corresponding to a space gap about twice to three times as large as a plate thickness of its own, it is possible to effectively supply microwaves to the upper side of heating plate 402.
  • rotary waveguide 39 when the "defrosting/grilling function" is selected, rotary waveguide 39 is located so as to make open section 58 face door 31b in order to construct the foregoing principal transmission channel.
  • microwaves are supplied just for predetermined first heating time T1, to supply the microwaves to the upper surface side of heating plate 402 of heating chamber 34 so as to defrost frozen food or the like.
  • rotary waveguide 39 is moved (rotated) to make open section 58 oriented in the direction parallel to door 31b, so as to supply microwaves just for predetermined second heating time T2. It is thereby possible to make microwave absorber 406 generate heat, thereby to warm or grill the frozen food from the lower side.
  • microwaves are supplied together to the upper side of heating plate 402 (for first predetermined time T1), to defrost frozen food from above, and thereafter the microwaves are supplied together to microwave absorber 406 (for second predetermined time T2), to heat the defrosted food from below.
  • the lower side of the frozen food is heated after the upper side thereof has been heated (defrosted), and there may be a case of a heat distribution of the food becoming non-uniform.
  • the position of open section 58 may be intermittently changed.
  • open section 58 instead of open section 58 first being stopped with the orientation parallel to door 31b continuously just for first heating time T1, open section 58 is stopped for the time shorter than the first heating time, to lightly defrost the frozen food.
  • open section 58 is located with the orientation vertical to door 31b, and heating (grilling) is performed by microwave absorber 406 for the time shorter than second heating time T2. This operation is repeatedly performed.
  • total time for direct heating (defrosting) with microwaves and a total time for heating (grilling) by microwave absorber 406 are not necessarily the same as first and second heating time T1, T2, and are decided as appropriate.
  • open section 58 may not be stopped with a predetermined orientation, but rotary waveguide 39 may be rotated at a constant rate.
  • heating (defrosting function) with microwaves supplied to the upper surface of heating plate 402 and heating (grilling function) by microwave absorber 406 on the under face of heating plate 402 are performed in a continuous and alternate manner.
  • Heating plates 402 shown in FIGS. 11A to 11C respectively correspond to those in FIGS. 9A to 9C .
  • the amount of the microwaves can be confirmed by means of a temperature of water placed on the upper surface of heating plate 402.
  • an insulator is placed as insulation spacer S on the upper surface of heating plate 402.
  • resin-made container V with 150-cc water W kept therein is placed. It is to be noted that insulation spacer S is used for preventing heat from heating plate 402 from being conducted to water W via resin-made container V, to measure a temperature rise of water W only with the diffracted microwaves.
  • FIG. 12A is a plan view of heating plate 402 placed inside heating chamber 34, as shown in FIG. 10A .
  • the front side is door 31b side
  • the back side is the back wall projecting section 420 (circulating fan unit storing section) side
  • the right is the right inner wall side of heating chamber 34
  • the left is the left inner wall side of heating chamber 34.
  • Directions of these seen from open section 58 of rotary waveguide 39 are respectively regarded as 180, 0, 90 and 270 degrees.
  • FIG. 12B represents the orientation of rotary waveguide 39 (open section 58) with strong directivity by means of angles.
  • back wall projecting section 420 circulating fan unit storing section
  • angles clockwise therefrom seen from above are taken as the plus side.
  • differences from the reference are plotted in increments of 15 degrees. It is found from the figure that the directivity is maximal with rotary waveguide facing forward (door 31b side) at 180 degrees, the directivity is next maximal with rotary waveguide facing backward (back wall projecting section 420 side), and the directivity is small with rotary waveguide facing the right or left.
  • FIG. 13 shows the orientation of open section 58, the amount of diffracted microwaves, and the difference from the rotation. That is, in the case of holding rotary waveguide 39 in the position where open section 58 faces door 31b (inner glass 61) side, microwaves radiated from rotary waveguide 39 can be efficiently supplied to the direction of heating plate 402. It is to be noted that also in the case of making open section 58 face back wall projecting section 420 (circulating fan unit storing section) side, the amount of diffraction of microwaves is large as compared with the case of making open section 58 face the right or left inner wall side.
  • control section 411 makes open section 58 radiate microwaves MW just for first predetermined time T1 in first position D1 where a large number of microwaves MW diffract, while making open section 58 radiate microwaves MW just for second predetermined time T2 in second position D2 where a small number of microwaves MW diffract, and hence it is possible to continuously defrost and cook frozen food while keeping the food placed on heating plate 402.
  • first position D1 is the position at 180 degrees or 0 degrees in FIG. 12B
  • second position D2 is the position at 90 degrees or 270 degrees in FIG. 12B .
  • first position D1 and second position D2 can be decided as appropriate with respect to each microwave oven 31.
  • control section 411 may make microwaves MW continuously radiated in first position D1 just for first predetermined time T1, and thereafter makes microwaves MW continuously radiated in second position D2 just for second predetermined time T2. Further, control section 411 may repeat continuous radiation of microwaves MW in first position D1 for first small heating time ⁇ T1 which is smaller than first predetermined time T1, and subsequent continuous radiation of microwaves MW in second position D2 for second small heating time ⁇ T2 which is smaller than second predetermined time T2, until respective totals of first small heating time ⁇ T1 and second small heating time ⁇ T2 become not shorter than first predetermined time T1 and second predetermined time T2.
  • heating plate 402 provided with microwave absorber 406 has been described.
  • microwave absorber 406 cannot be placed, in place of heating plate 402.
  • a similar effect can be obtained to the effect of the present invention that the inside of the door is used as the transmission channel for microwaves and the orientation of rotary waveguide 39 is controlled to adjust the amount of diffraction of microwaves to the upper side of the tray.
  • a temperature detecting section for detecting a temperature of the object to be heated may be provided, and only in the case of determining the object to be heated as frozen food due to its temperature being low, control section 411 may make rotary waveguide 39 as the directional feeding section face the direction of door 31b and stopped. It is thereby possible to make use of the defrosting function and increase the amount of diffraction of microwaves to the upper side of heating plate 402, so as to efficiently perform defrosting.
  • rotary waveguide 39 may not be made to face the direction of door 31b and stopped, but the object to be heated may be efficiently grilled by making use of the grilling function.
  • stopping rotary waveguide 39 from the beginning to the end is not necessary.
  • An operation of rotation after stopping for predetermined time may be repeated.
  • the stopping time may change depending upon the temperature of the object to be heated. The lower the temperature is, the longer the stopping time is made, and the higher the temperature is, the shorter the stopping time is made, whereby the amount of diffraction can be subjected to multistage control in accordance with the temperature of the object to be heated.
  • a weight detecting section for detecting a weight of the object to be heated may be provided, and especially in the case of determining that the weight of the object to be heated is large, control section 411 may make rotary waveguide 39 face the direction of door 31b and stopped. It can be considered that, when the weight of the object is large, its size is also roughly large, and there is a tendency that an object of a large size is resistant to heating into its central portion only by heat conduction. In this case, the object is considered to be easy to heat when heated with microwaves. It is therefore possible to make rotary waveguide 39 face the direction of the door and stopped, and increase an amount of diffraction of microwaves to the upper side of heating plate, so as to efficiently heat the large object into its center.
  • rotary waveguide 39 may not be made to face the direction of door and stopped, but the object may be grilled by making use of the grilling function.
  • stopping rotary waveguide 39 from the beginning to the end is not necessary.
  • An operation of rotation after stopping for predetermined time may be repeated.
  • the stopping time may change depending upon the weight of the object to be heated. The larger the weight is, the longer the stopping time is made, and the smaller the weight is, the shorter the stopping time is made, whereby the amount of diffraction can be subjected to multistage control in accordance with the weight of the object to be heated.
  • the configuration can be formed to have a misuse determining section.
  • control section 411 may make rotary waveguide 39 continue to rotate without being stopped.
  • control section 411 makes rotary waveguide 39 face the direction of the door and stopped, to allow microwaves to diffract to the upper side of the heating plate and be efficiently absorbed into food.
  • microwave absorber 406 for absorbing microwaves is provided on the lower face of the heating plate, all the microwaves inside the heating chamber can be safely consumed.
  • heating plate 402 may be provided so as press a switch when mounted in heating chamber 34. When the switch is disposed in a mounted position of the end of heating plate 402 and the switch is not pressed, it is possible to determine misuse in that regular heating plate 402 is not in use.
  • a temperature detecting section which detects a temperature of at least either heating plate 402 or the object to be heated, may be provided. When a temperature different from a predetermined temperature is detected, it is possible to determine misuse in that regular heating plate 402 is not in use.
  • a weight detecting section which detects a weight of at least either heating plate 402 or the object to be heated, may be provided. When a weight different from a predetermined weight is detected, it is possible to determine misuse in that regular heating plate 402 is not in use.
  • the present invention is applicable to a microwave heating device such as a microwave oven.

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  • Physics & Mathematics (AREA)
  • Electromagnetism (AREA)
  • Electric Ovens (AREA)
  • Constitution Of High-Frequency Heating (AREA)

Claims (11)

  1. Appareil de cuisson à micro-ondes (31) comprenant :
    une chambre de chauffe (34) pourvue d'une porte vitrée (31b) au niveau d'une ouverture frontale (38) pour recevoir un objet à chauffer ;
    une table de placement transparente aux micro-ondes (35) formant une surface inférieure à l'intérieur de la chambre de chauffe (34) ;
    un plateau (402) monté de manière détachable dans la chambre de chauffe (34) pour porter l'objet à chauffer ;
    une section de génération de micro-ondes (32) ;
    un guide d'ondes (33) pour transmettre des micro-ondes de la section de génération de micro-ondes (32) à la chambre de chauffe (34) ;
    une section d'alimentation directionnelle (39) dotée de directivité pour amener les micro-ondes du guide d'ondes (33) à la chambre de chauffe (34) ;
    une section d'entraînement (41) pour entraîner en rotation la section d'alimentation directionnelle (39) ;
    une section de commande (411) pour commander la section d'entraînement (41) de manière à faire tourner la section d'alimentation directionnelle (39) ;
    et une section d'alimentation (37) formée sous la table de placement (35) pour recevoir la section d'alimentation directionnelle (39),
    caractérisé en ce que
    la section de commande (411) fait tourner la section d'alimentation directionnelle (39) de manière à concentrer le rayonnement micro-ondes dans la direction de la porte (31b), si l'objet à chauffer est congelé, et amène les micro-ondes dans un espace au-dessus du plateau (402) en utilisant le verre de la porte (31b) en tant que canal de transmission principal.
  2. Appareil de cuisson à micro-ondes (31) selon la revendication 1, où le plateau (402) est une plaque de chauffe dotée sur son côté inférieur d'un absorbeur de micro-ondes (406).
  3. Appareil de cuisson à micro-ondes (31) selon la revendication 3, où la section de commande (411) arrête la section d'alimentation directionnelle (39) en une position dans laquelle la section d'alimentation directionnelle (39) fait face à une direction prédéterminée.
  4. Appareil de cuisson à micro-ondes (31) selon la revendication 3, où la section de commande (411) fait balancer la section d'alimentation directionnelle (39) à proximité d'une position dans laquelle la section d'alimentation directionnelle (39) fait face à une direction prédéterminée.
  5. Appareil de cuisson à micro-ondes (31) selon la revendication 3, où lors de la chauffe par micro-ondes, la section de commande (411) ralentit la section d'alimentation directionnelle (39) a proximité d'une position dans laquelle la section d'alimentation directionnelle (39) fait face à une direction prédéterminée, tout en faisant tourner la section d'alimentation directionnelle (39).
  6. Appareil de cuisson à micro-ondes (31) selon la revendication 1, comportant en outre une section de détection de température (10) pour détecter une température de l'objet à chauffer, où
    la section de commande (411) détermine si l'objet à chauffer est congelé ou non sur la base d'une sortie de la section de détection de température (10), et ordonne à la section d'entraînement (41) de faire tourner la section d'alimentation directionnelle (39) de manière à concentrer le rayonnement micro-ondes dans la direction de la porte (31b) s'il est déterminé que l'objet à chauffé est congelé, et ordonne à la section d'entraînement (41) de faire tourner la section d'alimentation directionnelle (39) dans une autre direction que la porte (31b) s'il est déterminé que l'objet à chauffer n'est pas congelé, de manière à commander l'alimentation en micro-ondes des espaces situés au-dessus et en-dessous du plateau (402).
  7. Appareil de cuisson à micro-ondes (31) selon la revendication 1, comportant en outre une section de détection de poids pour détecter un poids de l'objet à chauffer, où la section de commande (411) ordonne à la section d'entraînement (41) de modifier une orientation de la section d'alimentation directionnelle (39) sur la base du poids de l'objet à chauffer, de manière à commander l'alimentation en micro-ondes des espaces situés au-dessus et en-dessous du plateau (402).
  8. Appareil de cuisson à micro-ondes (31) selon la revendication 1, comportant en outre une section de détermination de mauvais usage pour déterminer que le plateau (402) est mal utilisé, où
    la section de commande (411) fait tourner la section d'alimentation directionnelle (39) lorsque la section de détermination de mauvais usage détermine que le plateau (402) est mal utilisé.
  9. Appareil de cuisson à micro-ondes (31) selon la revendication 8, où la section de détermination de mauvais usage comprend un interrupteur enfoncé par le plateau (402) lorsque le plateau (402) est monté dans la chambre de chauffe (34), et détermine que le plateau (402) mal utilisé n'est pas utilisé lorsque l'interrupteur n'est pas enfoncé.
  10. Appareil de cuisson à micro-ondes (31) selon la revendication 8, où la section de détermination de mauvais usage comprend une section de détection de température pour détecter au moins une des températures que sont une température du plateau (402) et une température de l'objet à chauffer, et détermine que le plateau (402) mal utilisé n'est pas utilisé lorsqu'une température détectée est différente d'une température prédéterminée.
  11. Appareil de cuisson à micro-ondes (31) selon la revendication 8, où la section de détermination de mauvais usage comporte une section de détermination de poids pour détecter au moins un des poids que sont un poids du plateau (402) et un poids de l'objet à chauffer, et détermine que le plateau (402) mal utilisé n'est pas utilisé lorsque le poids détecté est différent d'un poids prédéterminé.
EP09834343.7A 2008-12-25 2009-12-14 Appareil de cuisson a microondes Active EP2348257B1 (fr)

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JP2007225186A (ja) 2006-02-23 2007-09-06 Matsushita Electric Ind Co Ltd 高周波加熱調理装置
JP4979280B2 (ja) * 2006-06-19 2012-07-18 パナソニック株式会社 マイクロ波加熱装置
JP5116260B2 (ja) * 2006-06-19 2013-01-09 パナソニック株式会社 高周波加熱装置
JP2008190752A (ja) * 2007-02-02 2008-08-21 Mitsubishi Electric Corp 高周波加熱装置
JP5034667B2 (ja) * 2007-05-14 2012-09-26 パナソニック株式会社 マイクロ波加熱装置
JP5003273B2 (ja) * 2007-05-15 2012-08-15 パナソニック株式会社 マイクロ波加熱装置
JP4916381B2 (ja) * 2007-05-18 2012-04-11 パナソニック株式会社 誘導加熱調理器

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CN102265092B (zh) 2014-05-07
EP2348257A1 (fr) 2011-07-27
JPWO2010073528A1 (ja) 2012-06-07
WO2010073528A1 (fr) 2010-07-01
CN102265092A (zh) 2011-11-30
EP2348257A4 (fr) 2015-05-06
JP5310741B2 (ja) 2013-10-09

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